pooling for RpbContent
fetch alloc reductions
putresp pool; down to 5 allocs per store
lots of changes. no more racing on client.Close (node connection could be nil), Head methods, parallel tests
FetchHead test
fix broken import... sigh
re-codegen; replace all 'proto.ErrWrongType'
small change to wercker
another small wercker change...
Merge pull request #11 from philhofer/less_heap

Fewer allocs; fix possible race; re-codegen; add Head methods